Effective ammonia recovery from swine excreta through dry anaerobic digestion followed by ammonia stripping at high total solids content
Effective ammonia recovery from swine excreta through dry anaerobic digestion followed by ammonia stripping at high total solids content
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DOI：
10.1016/j.biombioe.2016.04.003
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发表时间：
2016-07
影响因子：
6
通讯作者：
Weiwei Huang;Ziwen Zhao;Tian Yuan;Z. Lei;W. Cai;Huifang Li;Zhenya Zhang
中科院分区：
文献类型：
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作者：
Weiwei Huang;Ziwen Zhao;Tian Yuan;Z. Lei;W. Cai;Huifang Li;Zhenya Zhang
本研究研究了通过干式厌氧消化 (AD) 和氨汽提从猪排泄物中回收氨。通过 8 天的试验，评估了不同操作条件（包括温度（25–55°C）、总固体量（TS，20%–35%）和初始 pH（7.0–12.0））对氨生产的有机氮（有机-N）转化和过程动力学的影响。所有实验数据都很好地符合干 AD 期间的伪一级动力学模型，并且当干 AD 在 55 °C、20% TS 和初始 pH 10.0 下进行时，最大有机氮质量转化率为 65.1%。沼气产量及其成分的变化表明了干AD期间参与从猪排泄物中产生氨的细菌的生物活性。最后，猪排泄物中超过90%的总氨氮(TAN)通过空气剥离在TS约20%下被有效回收。重申一下，短期干法 AD 与氨汽提相结合实现了约 60% 的总氮回收效率。
This study investigated ammonia recovery from swine excreta through dry anaerobic digestion (AD) and ammonia stripping. The effects of different operation conditions including temperature (25–55 °C), total solids (TS, 20%–35%) and initial pH (7.0–12.0) were assessed on ammonia production in terms of organic nitrogen (organic-N) conversion and process kinetics through 8 days' trials. All experimental data fitted well to the pseudo first-order kinetic models during dry AD and the maximum organic-N mass conversion ratio was estimated to be 65.1% when dry AD was conducted at 55 °C, 20% TS, and initial pH 10.0. Changes in biogas production and its composition signaled the bioactivity of the bacteria involving in ammonia production from swine excreta during dry AD. Finally, greater than 90% of the total ammonia nitrogen (TAN) in swine excreta was efficiently recovered by air stripping at TS about 20%. Restated, the combination of short-term dry AD with ammonia stripping achieved about 60% of total nitrogen recovery efficiency.